An Image Encryption Method Based on Chaotic Map and Chaotic S-Box Substitution

Abstract

The present invention provides an image encryption method based on chaotic mapping and chaotic S-box substitution in the technical field of image encryption, including: step S10, obtaining a color image file and performing hash calculation to obtain a hash value, based on the hash value calculation system Parameters; Step S20, generating four initial values ​​of the four-dimensional hyperchaotic map based on the hash value, and then obtaining four sets of chaotic pseudo-random sequences; Step S30, extracting sequences based on the chaotic pseudo-random sequences and system parameters W z , using the sequence W z And use the S box of AES algorithm to generate chaotic S box; Step S40, carry out Arno l d scrambling to color image file to obtain scrambling image, utilize chaotic S box to carry out byte substitution to scrambling image and obtain replacement image; Step S50, Using chaotic pseudo-random sequence and system parameters, image diffusion encryption is performed on the three components of RGB in the substitution image to obtain three ciphertext data, and the encrypted image is obtained based on each ciphertext data. The invention has the advantages of greatly improving the security of image encryption.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on chaotic mapping and chaotic S-box substitution. Background technique [0002] With the development of the Internet and multimedia technology, the dissemination and influence of digital images continue to expand, and a large number of digital images are transmitted, shared and stored on the Internet every day. How to ensure the security of digital images involving military, financial, political, medical and other sensitive information during transmission and storage has always been a hot research topic in information security. The most direct way to protect digital images is to encrypt them. However, because digital images are different from text information, they have the characteristics of strong correlation, large amount of data and high redundancy. RSA, Data Standard Encryption (DES), Advanced Encryption Standard (AES), Internationa...

AI Technical Summary

Problems solved by technology

However, because digital images are different from text information and have the characteristics of strong correlation, large data volume, and high redundancy, RSA, Data Standard Encryption (DES), Advanced Encryption Standard (AES), and International Data Encryption Algorithm ( IDEA) and other encryption algorithms are not suitable for the encryption of digital images, which makes digital images have great security risks in the process of transmission and storage.

Images